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Which grouping has the least complex body plan? If you were on a research expedition in the kingdom of Tonga, a coral atoll in the South Pacific, would you find these organisms?


YES, I WOULD FIND THOSE ORGANISMS.

The Kingdom of Tonga is a Polynesian Archipelago in Oceania consisting of 176 islands. During a month long coral reef research mission in Tonga, the Foundation focused on islands in the Ha’aipi group, Vava’u and Niuatoputapu. Haʻapai, directly west of the Tonga trench in the central part of Tonga, is made up of 51 volcanic islands and includes Kao, the highest point in the kingdom (1,046 m). Vavaʻu has one large island and 40 smaller ones, and includes the second largest city, a large harbor.  The north side of the main island is lined by 200 m high cliffs and extensive open network of fjord-like channels that stretch inland on the north side. Nearly 300 km north of Vavaʻu, close to the border of Samoa is Niuatoputapu, a sparsely inhabited (population 150)  eroded remnant of a volcano surrounded by a large uplifted reef. This island was badly damaged by a tsunami following a submarine earthquake off Samoa in 2009.

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Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/4.00 of the original amount. How long ago was this plant alive?

Answer:

The plant was alive for 1155 years

Explanation:

Any radioactive decay process follows the exponential law which is mathematically expressed as:

N(t)= N(0)e^{-kt}------(1)

where N(0) = initial amount of the radioactive material

N(t) = amount at time t

k = decay constant

The decay constant is in turn related to the half-life t1/2

k = \frac{0.693}{t1/2}----(2)

It is given that t1/2 of 14C = 5730yrs. Therefore:

k = \frac{0.693}{5730}=1.21*10^{-4}yr-1

In addition it is mentioned that:

N(t) = 1/4*N(0)

substituting this in equation (1) gives:

1/4*N(0)= N(0)e^{-1.21*10^{-4}t}

t = 1155 years

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Hy did dr. tyson decide to exclude pluto from the exhibits of planets

Neil deGrasse Tyson has received hate mail for leading the charge to demote exhibit of planets at the American Museum of Natural History did not depict Pluto. why Pluto had such a grip on the American body and soul," Tyson tells at the Hayden Planetarium in 2000, he decided not to include Pluto.

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What is the relationship between the atomic numbers and ionic radii of the elements in the group 2A? What is the relationship between atomic numbers and first ionization energies? (2A group) Why do these relationships exist? Propose an explanation for each of these relationships. (2A group) Are these relationships consistent with the periodic trends that you have been studying? (2A group)

As the atomic number increases, the ionic radius increases.
As the atomic number increases, the first ionization energy decreases.

These trends both exists because as we proceed down the group, the size of the atom increases due to addition of an electron shell. The increased number of electrons increase the shielding effect, meaning the ion is not held together as tightly, increasing its size, and the outer most electrons are not pulled towards the nucleus as strongly, making it easier to remove them.

Posted in Chemistry

Atomic Number, Ionic Radius, and First Ionization Energy help! "Why do these relationships exist? Propose an explanation for each of these relationships." and "Are these relationships consistent with the periodic trends that you have been studying?"

The answer 

Why do these relationships exist?: The higher the atomic number of an element means the atomic radii will be bigger because there are more electrons and shells/orbitals involved which will make the element bigger in size. The more electrons there are means the more shells there are which equals to a bigger atomic radii. The first energisation energy will be lower the bigger the atomic number because a larger atomic number means more electrons. This means more shells and the electrons will be further away from the nucleus which equals to less nuclear attraction. This means as the electrons get further away from the nucleus (from the larger amount of electrons and more shells and shielding from the shells closer to the nucleus) there will be less attraction holding the electrons to the nucleus which will make it easier to remove. I'm not sure what the next question means, but I hope this helps explain why the relationships exist :)

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What is true of saturated fatty acid chains? a. They are more healthy that unsaturated fats. b. They contain only single covalent bonds. c. They are only made in leaf cells of green plants. d. They contain at least one double or triple bond.

B. They contain only single covalent bonds

Although the side chains may contain double bonds, the main chain of a saturated fatty acid molecule contains only single covalent bonds, which is why it is referred to as being "saturated".

Posted in Chemistry

Which of the following correctly completes the following equation: Nitrogenous base + sugar + phosphate group = ? Nucleotide Amino Acid Enzyme Antibody

I am pretty sure that  the following which correctly completes the following equation is : Nitrogenous base + sugar + phosphate group = Nucleoside. Just according to the main poins of its definition you can easily assure yorself it is correct, as Nucleotide is an organic compound which is made from of nitrogenous base, a sugar, and a phosphate group. 
Do hope it will help you! Regards.

Posted in Chemistry

While researchers have discovered that there are an excessive number of receptor sites for _________________, it is not the only neurotransmitter involved in schizophrenia.

I think the correct answer is dopamine. While researchers have discovered that there are an excessive number of receptor sites for dopamine, it is not the only neurotransmitter involved in schizophrenia. The main support for the theory that too much dopamine causes schizophrenia is the fact that antipsychotic medications, which are used to treat schizophrenia, block dopamine receptors. Hope this helps.

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Why do single cell organisms divide?

Single-celled organisms which use asexual reproduction can do so very rapidly simply by dividing into two equal halves. This is called binary fission. In yeasts the cell does not divide equally in two halves; instead, there is a large mother cell and a smaller daughter cell. This is called budding.

Posted in Chemistry

Number 4. Give 2 examples of how plants and animals affect their environment

Plants will die and make more plants because they drop a seed when they die the animals will eat the plants tot survive so that way the animals can progress the plants and the animals kinda help each other in a way

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Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

Explanation:

Photoelectric effect: Electrons are ejected out from the surface of metal when light of sufficient frequency falls upon shiny surface of metals. light is made up small bundles of energy packets named photons which when falls on surface transfer their energy to electrons due which electrons ejects out of the metallic surface. The energy for one photon was given by expression:

E=h\nu, or E\propto \nu

h=Planck's constant, \nu= frequency of the light

Kumar can increase the energy of emitted electron by using light with higher value of frequency than the frequency of red light. This is because the energy  carried by the photon of a light is directly proportional to the frequency of the light. Higher the value of frequency of light higher will be the value of energy of a photon. And photon with higher energy will impart more amount of energy to an electron while ejection.

Posted in Chemistry

Construct an explanation for how balancing an equation supports the Law of Conservation of Mass

The law of conservation of matter states that matter is neither lost nor gained in traditional chemical reactions; it simply changes form. Thus, if we have a certain number of atoms of an element on the left side of an equation, we have to have the same number on the right side. This implies that mass is also conserved during a chemical reaction. The water reaction, for example:2H2 + O2 2H2O

+
2 * 2.02g + 32.00g = 2 * 18.02g


The total mass of the reactants, 36.04g, is exactly equal to the total mass of the products, 36.04g This holds true for all balanced chemical equations.

Posted in Chemistry

What are the bonds in a secondary protein structure? (Explanation)

"HYDROGEN BONDS"

In Secondary structure of Proteins, they organised into regular structures known as alpha-helices (alpha-helixes) and beta-pleated sheets. 

Hope this helps!

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Which direction does air circulate into low pressure zones in the northern and southern hemisphere

The rotation of the earth viewed from the south pole is clockwise.
a low pressure area would have a clockwise turning and a high pressure area would have a counterclockwise turnig

Posted in Chemistry

Which direction does air circulate into low pressure zones in the northern and southern hemisphere

Air flows counterclockwise and inward for all low pressure systems in the Northern Hemisphere and clockwise and inward in the Southern Hemisphere. And high pressure systems flow clockwise and outward in the Northern Hemisphere and in the Southern Hemisphere they flow counterclockwise and outward.

Posted in Chemistry

How are starch cells in plants and fat cells in animals similar and different

I can not answer your question because i am a  person who is not smart
 and will never become smart

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What are some of the body's internal defenses

The immune system helps prevent diseases

Posted in Chemistry

What are some of the body external defenses

these include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.

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Are most microscopic organisms harmless

Microorganisms are, by definition, small living things. All living things need a source of food to live, and each kind of micro-organism gets/ use its food differently from another. Thus some might be harmful, and others might not.A single micro-organism might not be enough to "harm" but all micro-organisms live by the billions/trilllions. When you got an army of them, then they can cause a ignificant change on other organisms.

Posted in Chemistry

Which of the following best describes the use of a nonrenewable resource? (2 points) California has several power plants that use heat from the Earth to generate electricity. In the state of Texas, you can find miles of windmills that are used to generate electricity. Natural gas is a great alternative to electricity for cooking. The electronic signs along the highway are run by solar power.

I think the correct answer from the choices listed above is the third option. Natural gas is a great alternative to electricity for cooking is the statement that describes the use of a nonrenewable resource. Natural gas is a nonrenewable resource since it takes a lot of time to be able to form this. Hope this answers the question.

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Auroras are lights that appear at Earth’s northern and southern poles. What is the main cause of an aurora? A) Solar wind enters Earth’s atmosphere, and particles interact with ions. B) Bubbles of gas are ejected from Earth’s outer crust. C) Sunlight reflects off the surface of the Moon during an eclipse. D) The northern and southern poles are cooler than the rest of Earth.

A full understanding of the physical processes which lead to different types of auroras is still incomplete, but the basic cause involves the interaction of the solar wind with the Earth’s magnetosphere. The varying intensity of the solar wind produces effects of different magnitudes, but includes one or more of the following physical scenarios. so the answer is A

Posted in Chemistry

Acetone and water are miscible. Acetone and hexane are also miscible. What is the possible explanation for their miscibilities, considering that water and hexane are immiscible?

Acetone is miscible because it has a C=O bond, while its C-C-C carbon chain makes it miscible with hexane. However, hexane is non-polar while water is polar, and since the two molecules have different polarities, they are immiscible.

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